Telegraph switching apparatus.



Patented my .2, I901.

E. w. wuss. TELEGRAPH SWITCHING APPARATUS.

(Application filed Mar. '16, 1901.)

(No Model.)

WITNESSES @NTTED STATES PATENT @Tmcn.

FRANCIS W. JONES, OF NEXV YORK, N. Y.

TELEGRAPH SWITCHING APPARATUS.

EPECIFICATION forming part of Letters Eatent No. 677,453, dated .1 uly2, 1901.

' Application filed March 16, 1901. Serial No. 51,476. (No model.)

To all whom it may concern:

Be it known that I, FRANCIS W. JONES, a citizen of the United States,residing in the city of New York, in the county and State of New York,have made certain new and usefullmprovements in Telegraph SwitchingApparatus, of which the following is a specification.

My invention relates to the connection of a branch telegraph-officelocated on a loop with a main telegraph-wire at a main station orofiice.

The object of my invention is to provide for throwing out one side of adamaged loop and working a ground return circuit in place thereof and tosimplify the apparatus and decrease the cost of equipment.

The accompanying drawing illustrates my invention.

At the central station there is the wellknown pin-switch b. The mainline 1 enters the office, passing through the spring-jackj. Theelectrical connection 2 connects the spring-jack with a vertical stripat on the board I). The main-line generator (2 is connected by wire 3 tothe button 4 and a pin connects the button and strip. There is aspring-jack 41in the loop 5 6, extending to a substation. The jacks iandj have their respective contacts connected together by flexibledouble conduoting-cordf, having suitable double contact-plugs for eachjack. At the substation there is the spring-jack h in the loop 5 6, arelay r and key 70 being connected in circuit through wires 7 8, theflexible cord g, and the jack-plug 0. There is a sounder s and localbattery m in a local circuit operated by the relay 0*.

S is a switch having two movable and three fixed contacts. The movablecontact a normally forms part of the conductor 8, and the movablecontact 1; is connected to a tap-wire 13, the opposite end of which isconnected to the conductor '7 between the instruments 7t 7' and thespring-jack h. The fiXed contact 12 is connected to ground by wire 9.The fixed contact 11 is connected to ground through the resistance R,and this resistance is of such a size that the main line generator (Zwhen connected through the resistance R will not yield an excessivestrength of current compared with that for which the instrument 7' isadjusted to operate. The fixed contact 10 of switch S is connected toone divided terminal of the conductor 8. The other terminal of theconductor 8 is connected to the movable contact a. The two contacts aand o are mechanically united by a bar of insulating material, fixed towhich is a button 14, by means of which the two cont-acts are caused tomove together in a well-known manner. It is to be noticed that thecontact 12 is placed in such a position that the contact '2) willmomentarily engage with it during the time that the contact u is passingfrom 10 to 11. When n and 12 are in contact, the loop 5 G will be openedat 10 and a circuit will be made from generator 01 via 3, 4, 2, j, f,t', a, 5, h, '7, 13, o, 12, and 9. The annunciator a, will be includedin a circuit of very low resistance. The strength of current will begreat and the drop will fall. The magnet of the annunciator a and itsarmature are constructed and adjusted so as not to respond to any lesscurrent strength. By this means the operator at the central station ormain office is given notice that the substation desires his attention.The contact necessary to drop the annunciator ct'is but momentary, andthe contact a, engagingthe fixed contact 11, establishes a circuit fromthe generator d Via 3, 4, n, 2,j, t', 5, g, 7, 7a, 1, S, u, 11,and R toground return. This circuit, owing to the presence of the resistance R,relay r,magnet of a, and generator d, is substantially operated with thesame strength of current that was present in the complete circuit. Thesubstation and main station may then communicate and reestablish acomplete working circuit by mutual understanding. We have so far assumedside 6 of the loop to be open or out of order. Suppose now the side 5 ofthe loop to be out of order or broken. The substation then reverses theconnection of the pin 0 in the jack h and moves his switch S to itsextreme left-hand position. A new circuit is thus formed, completelycutting oft" the central or main office generator (1 and including theelements R, 11, u, 8, r, 7, 7c, 7, 0, 6, f,j to main line 1 andgenerator at distant station. The substation can thus communicate withthe distant station, and this facility for communicating over eitherside of a damaged loop and over one side without the oo- ICC operationof the main office is due to the presence ofthe means for reversingtheconnection of the instruments at the substation with respect to the loop5 6.

The switch 21 is a two-point switch connected to opposite sides ofresistance R to cut said resistance out of circuit when a circuit ismade up excluding the generator d at the main office-as, for instance,when the side 5 of the loop is open and the plug 0 has been reversed, asdescribed.

What I claim, and desire to secure by Let? 1 line, a main station, asubstation-loop conters Patent, is'

1. The combination of a main telegraphline, a main station, a loopconnected into said line at the main station, extending to a substation,an electromagnet in said circuit at the main station,telegraphinstrum'ents included in said loop at the substation, a switchat the substation having three fixed contacts connected to a dividedterminal of the loop,'

a grounded artificial resistance, and a ground, respectively, and twomovable contacts connected to the other divided terminal of the loop andto a tap-wire 13 connected to the opposite side of the loop at a pointbetween the instruments and main line.

2. The combination of a main telegraphline, a main station, asubstation-loop connected into said line at the main station, a.

loop at the substation, a switch at the substation having two separablecontact-points included in one side of said loop and a con tactconnected to a grounded resistance whereby the loop may be divided andthe artifieial resistance substituted for one side thereof withoutaffecting the magnet at the main station. 7

3. The combination of a main telegraphnected into said'line at the mainstation, a magnet adjusted to respond to an abnormal current strength inone side of said loop at the main station, telegraph instruments in saidloop at the substation, means for re-' Versing the connection of saidinstruments with respeetto the loop at thesubstation,

and a switch at said station having twovsepa+ rable contact-pointsincluded in one side of said loop with a ground-contact whereby the loopmay be divided, either side thereof grounded, and the substationinstruments included insuch grounded circuit.

FRANCIS WV. JONES; \Vitn'esses JOHN F. CLEvERDoN, WILLIAM J. MUNDELL,

